Improvement in concrete sidewalks



L.. P. ROGERS.`

Concrete Sidewalks.

Patenfed Dec. 3.1872.

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mbz sses UNITED STATES PATENT FFICE.

LOUIS P. ROGERS, OF HARTFORD, CONNECTICUT.

IMPROVEMENT IN CONCRETE SIDEWALKS.

Specification forming part of Letters Patent No. i, dated December 3,1872.

Y accompanying drawing and to the letters of reference marked thereon.

Like letters in the figures indicate the same parts.

Figure l is a perspective View of my invention, showing its generalconstruction. Fig. 2 is a cross-section upon the line :o y, Fig. 1. Fig.

. 3 shows the end of one of the beams of my improved sidewalk restingupon the curb.

a a are wooden beams or blocks inserted between the sides of the bentplates forming the beams b. .b b are beams, of wroughtiron plates bentinto the form shown in the drawing, curved over the top, andbent out atthe lower edges to serve as a support for the arched plates o. 'c o arethin iron plates, arched upward, and resting upon the outward-turnedlower iianges of the plate-beams b. These arched plates are intended tobe of only sufiicient thickness to support the concrete or materialabove during construction. cl is the concrete, forming the principalthickness of the sidewalk. 1t is intended to be of asphaltum and gravel,as is now used for sidewalks and similar purposes. It is of suflicientthickness to sustain any load or shock that may come upon it independentof the thin plate c used to support it until it has set and become hard.This filling material forming the arches of the sidewalk may be ofordinary cement and gravel concrete, or of any of the bton compositionsin Ordinary use. Above this con crete a layer of brick or flagging-stonemay be placed, as shown at g in Fig. 2. e is the support for the ends ofthe beams b. These latter may rest upon a stone curb at each end or uponan iron beam, as shown at Fig. 1. fA

is an opening through the iiooring to admit light, if it is desired tohave vaults below.

My improved sidewalk, resting only lat the ends of the beams and forminga solid structure above the ground, cannot be disturbed by frost. It isalso particularly applicable to places where it is desired to havevaults beneath.

What I claim as my invention is- 4 l. The combination of the wooden beamor blocks a with the bent-plate beam b passing over the top and thearched plates c, for the purpose of sustaining the concrete flooring d,substantially in the manner described.

2. The compound beam a. b, constructed as herein specified, with thelower edges of the plate turned outward to support the intermediatestructure, substantially as described.

3. A sidewalk composed of the devices a b o d, when constructed andarranged substantially in the manner described.

` LOUIS P. ROGERS.

lVitnesses:

THEO. G. EL-Lrs, BEN. A. COOKE.

